Floor scraping and sanding machine



Nov. 22, 1949 J. T. SIMPSON FLOOR SCRAPING AND SANDING MACHINE 2 Shets-Sheet 1 Filed Feb. 6, 1948' v IN VEN TOR. JAMES Z SIMPSON, DECEASED MADEL 1N5 1g/mxzso/v W/LL/AM Patented Nov. 22, 1949 James li ,Siinpsom. deceased; QIat'e off'MacomGa :b'yl Madeline. Simpson Williams; admmistratrmi.

Macon; Ga;

Appli'catinnrFebmary 6, 1948, Serial No. 6,718

g '3 Claims. ,1;

flhis inventionnrelates: tonal-floor scraping? a sending :machine and .has' for -antobject thereof tmprovide an improved machine of this nature which ca'n be used toibothiscrapeand sand the floor 'simultaneously and which can, :bya simple adjustment,be used tosanda=fioor withoutl'scrapingsit; and without :thenecessity ofremoVingzthe scraping blades.

A=:fu1!ther objectof this invention is: to .-pr-'- vi'de aacombin'ed,sandingg and scraping. machine which will-sandthe fioor area immediately after the scraping b1ade has passed thereover and :before the-nextrscrapingaction-stakes place, therebyrtendingnto avoid theausualwscraped:or rasped floor Ssurface "provided by the-conventional: scrap- :ers; In -"addition; rwhen the floonsurface "has been scraped an'd :sanded to the approximately finishedsurface ztheisame machine; by :making a e-slight adjustment' an'd withoutremoving any parts, tmay be used for making afinal :light sand- :ingractions onthe fioor surface to provide thefinal ifinishedismo o'th .fl'o'or surface'idesired- 'Withzthe 'z-foregoing'iand other objects in 'view, as will hereinafter :become apparent, this inventionincludes 7 the combinations, constructionan'd arrangementof "parts hereinafter set forth, claimed} andxillustratedhon the accompanying drawings; wherein? Figs: Z1 is Ja front eleva'tional view; partly in section of the floor scraping and sandingmachine of this invention;

Fig. 2 is a side leva tional view of Fig. 1;

.Fig; 3 is an enlargededetailed view-of the :biade mounting, and

Fig. 4 is a,perspective detail view of one blade.

There is shown- 'at fll the fi'ccrscraping and sandinglmachine of this-invention including-a dramework or housing H mounted on wheels or mol-1ers"l2-. Mounted on the h'ousing I l directly vover the rear, rollers I2 is anwelectricm'otor 14 controlled rby a switch IS convenientIy'mOunted zoni a Z-handl'e' l6' secured at i 'l to theirear end roii theihousingl I. A.,poWer wire-;.| 8 to the switch fimayibe attachedto anyzsuitable electric power source.

Mounted directly over the front rollers i2 is the @perating drum 20;;iiihexdi'um 20 beings'piro Ntided with a shaft extendingethroughz its axis into journal supports 2|. Extending into the top of each journal support 2| is a knob 22 connected by a reduced neck 23 to the bottom of a bolt 24 threaded through a nut 25 aflixed to the housing I I and terminating in knurled heads 26. At the outer side of one journal support 2| there is provided a projecting guide pin 21 which extendsinto a suitably formedvertical ignite-s11): 28 in .an upright 3n"0f th8 housing 11'. the otherside, the drum shaft extends through" a guide sleeve 3| and has a pulleylfi 'keyed thereon. I A-power belt 33 connects-the:drumshaftlpulley 32 to a pulley 34 keyed onsthe-motorshaft 35 of the motor I 4.

Secured toand spacedlabout the drum ZO'iby stud bolts 40 are idurcelldlanmibbr cushions 3'B mountedon baseplatesiflj Sheetsof sand paper 38-are detachably wrappedlandlsecured about the cushions 36' by any .sui table. conventional means. As h'erlefl shown,-..the'base .plates 31 secure the ends of the-sandpaper '38I'against the surface of the drumlfflll Between each-pair of T cushions '36 there is attached -aflblade support' lili to the drum 2]]; As shown, eachbladesupport 4i bonsistsof an angle bar of :spring materiallhavingnlits leading. edge 42 :securdto the drumlifl'fby a s'tudbo'lt 43 While its after edge is provided with circumferentiallyextendingslot's through which stud'bolts 46' are affixed ito'the drum. "201 Secured to the blade supports Ai'are the cutter blades '41 by means'of stud bolts 43: shown in Fig. 4, each blade is provided with a series of g g" cutter edges 50 s'eparated'by 5 57f gaps "5f which are ground te deep. The edges 50 are sharpened to a chiseledge' andthenrolled-onswaged to provide a hooked. scraper edge .poiritingin the direction (ii rotation O'f th'e diuni'ifl.

As shown, the cuttingedges ofone blade are oifset from the cutting edges of'the next' bla'de. "The two Iblades,..not"'vis'ib1e in "Fig.1; are-each vofiset 'by one-quarter ofT-a cutteraedge width so thatthere' is a complete oveilappih'gicfth'e cutting I blades in one c'ompiete revolution 'of' the drum 2B. Insteadof 'making the blades ina set of four, as .just described', the "blades could be made identical; and then mounted in ofiset relation to each otherr As norma'llymounte'd, "the edges of't'he blades '41 are one-quarter 'of'lan inch within the circumference of the "surface of the sandpaper 38; g

In operation, with the blade's and' 'tli'e sand .paper.properlyimount'ed, the threaded shaft or bolt 24 is adjustedto lower-the drum withinth'e jhousing, thus causing; the .cu's'hior'i 36to cornpress until the blade edges 50 are the desired amount below the bottom edge of the front rollers I2. The amount that the blade edge is below the roller determines the maximum cut that each blade can make. When the drum is rotating, each cut is followed by a sanding operation by the succeeding cushion and sandpaper; the drum rotating counterclockwise as viewed in Fig. 1. Due to the position of the weighty motor I4 directly over the rear rollers 12, the operator can easily control the pressure on the drum 20 and the cutting edge 50 by means of the handle I6, by merely tilting the handle downward to lessen the pressure and upward to increase the pressure. When the floor surface has. been scraped and sanded to approximately the desired condition, a final finish can be provided on the floor by then rotating the knurled boltheads 26 to raise the cutter edges 50 to slightly above the bottom edge of the front rollers l2, and then continuing the operation of the drum. In this position, the blades will no longer do any cutting action, but the sand paper will still sand and polish the floor with a light pressure to apply a final smooth finish.

While the device has been shown and the structure described in detail, it is obvious that this invention is not to be considered as being limited to the exact form disclosed, and that changes may be made therein within the scope of what is claimed, without departing from the spirit of the invention.

Having thus set forth and disclosed the nature of this invention, what is claimed is:

1. In a floor scraping and sanding machine, a drum, a plurality of scraping knives, means for adjustably and resiliently supporting said knives about said drum, said knife supporting means comprising resilient angle bar means, the leading edge of said bar means being secured to said drum, the leading angle face providing a knife supporting surface, the after edge of said angle bar means being provided with circumferentially extending slots and a stud bolt extending through each of said slots to said drum, each knife having a plurality of spaced apart serrated cutting edges thereon, the cutting edges of each knife being in staggered relationship to the cutting edges of at least one other of the knives, and a plurality of resilient sand paper supporting means, said scraping knives and said sand paper supporting means alternating about the periphery of said drum, the outer periphery of said sand paper supporting means being normally greater than the outer periphery of the knife cutting edges, and means for adjusting said drum in said machine to compress said resilient sand paper supporting means, as said drum rotates, to cause the periphery of said sand paper supporting means to coincide with the knife cutting edges periphery, whereby both cutting and sanding may be performed in alternating sequence on a floor surface when the peripheries coincide, and sanding alone may be performed when the drum has been adjusted to permit the periphery of the sanding surface to remain substantially greater than that of the cutting edges.

2. In a floor scraping and sanding machine, a drum, a plurality of scraping knives, means for adjustably and resiliently supporting said knives about said drum, said knife supporting means comprising resilient angle bar means, the leading edge of said bar means bein secured to said drum, the leading angle face providing a knife supporting surface, the after edge of said angle bar means being provided with circumferentially 2,488,834 If s extending slot means and a stud bolt extending through each of said slot means to said drum, and a plurality of resilient sandpaper supporting rubber cushion means, said scraping knives and said sandpaper supporting means alternating about the periphery of said drum, the outer periphery of said sand paper supporting means being normally greater than the outer periphery of the knife cutting edges, whereby sanding alone may be performed, and means for adjusting said drum in said machine to cause said peripheries to coincide on a floor surface to both out and sand in alternating sequence.

3. In a floor scraping and sanding machine, a drum, a plurality of scraping knives, means for adjustably and resiliently supporting said knives about said drum, said knife supporting means comprising resilient angle bar means, the leading edge of said bar means being secured to said drum, the leading angle face providing a knife supporting surface, the after edge of said angle bar means being provided with circumferentially extending slots and a stud bolt extending through each of said slots to said drum, each knife having a plurality of spaced apart serrated cutting edges thereon, the cutting edges of each knife being in staggered relationship to the cutting edges of at least one other of the knives, and a plurality of resilient sandpaper supporting means, said scraping knives and said sandpaper supporting means alternating about the periphery of said drum, the outer periphery of said sand paper supporting means being nor,- mally greater than the outer periphery of the knife cutting edges, and means for adjusting said drum in said machine to compress said resilient sand paper supporting means, as said drum rotates, to cause the periphery of said sand paper supporting means to coincide with the knife cutting edges periphery, whereby both cutting and sanding may be performed in alternating sequence on a floor surface when the peripheries coincide, and sandin alone may be performed when the drum has been adjusted to permit the periphery of the sanding surface to remain substantially greater than that of the cutting edges, the knife cutting edges being curved forwardly in the direction of rotation of said drum.

MADELINE SIMPSON WILLIAMS, Administratria: of the Estate of James T. Simpson, Deceased.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

